Kaiho et al. (2001) report sulfur isotope and chemical data for samples from the Meishan (China) Permian-Triassic (P-T) boundary section, which they interpret as evidence for a large-scale impact event that penetrated Earth's mantle and formed a crater ∼1000 km in diameter. We disagree with their interpretation in all major points.


First, Kaiho et al. interpret Fe-Ni-Si–rich grains as “impact- metamorphosed grains.” This interpretation is not supported by their (or other) data. The data in Table 1 of Kaiho et al. are of insufficient quality. Variations in the amounts of Ni, Al, Mn, and Cu do not indicate the presence...

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